Refer to Exercise 7.35. Suppose that we want to estimate the average decay rate of fine particles produced from oven cooking or toasting to within .04 with 95% confidence. How large a sample should be selected?

Data from Exercise 7.35

A group of Harvard University School of Public Health researchers studied the impact of cooking on the size of indoor air particles. (Environmental Science & Technology, September 1, 2000.) The decay rate (measured as mm/hour) for fine particles produced from oven cooking or toasting was recorded on six randomly selected days. These six measurements are:

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DECAY .95 .83 1.20 .89 1.45 1.12